Cranberry Streusel Pie

Big news: my son was born! Which is why I haven't been blogging for the past couple of months. I know how much you missed me :p
Anyway, a friend wanted this recipe, so I'm back!
This really is truly a delicious pie. How delicious you may ask? Well, lets look at the facts: 1) My beloved husband is, let's face it, a bit of a picky eater; 2) He doesn't like to eat the same food over and over again (the exception being, of course, tacos); 3) He's asked me to make this pie 3 times in the past 3 weeks. I'd say this is a winner.
We've variated a few times on the ingredients used, and can confidently say that it is fine to leave out the walnuts if you don't like/have walnuts, also we recommend substituting a cup of the cranberries with a cup of frozen strawberries, as it is just as tasty.

---Cranberry Streusel Pie---

Ingredients:
-One pie crust (Uncooked I think, although the recipe doesn't seem to specify)
-2 c. fresh/frozen cranberries
-1/4 c. sugar
-1/4 c. packed brown sugar
-1/2 c. walnuts
-1/2 tsp cinnamon
-1 egg
-1/3 c. sugar
-1/4 c. butter, melted
-3 Tbsp flour

Directions:
Stir together the cranberries, 1/4 c. sugar, brown sugar, walnuts, and cinnamon together and pour into the (uncooked?) pie crust. Whisk together the egg, 1/3 c. sugar, butter, and flour together and pour over the cranberry mixture. Bake at 400 degrees for 20 minutes, and then at 350 degrees for 30 more minutes or until the streusel is golden.